<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>xiaomi</title>
  <style>
    .box{
      width: 1570px;
      height: 570px;
      background-color: #4CAF50;
    }
    .left{
      width: 290px;
      height: 570px;
      background-color: #ff8500;
      float: left;
    }
    .right{
      height: 570px;
      width: 1270px;
      background-color: #cccccc;
      float: right;
    }
  </style>
</head>
<body>
<div class="box">
  <div class="left"></div>
  <div class="right"></div>
</div>
</body>
</html>
